Abstract
The effects of different laser shock peening (LSP) impacts on the three-dimensional displayed distributions of surface and in-depth residual stress at a laser spot of AISI 304 stainless steel were investigated by X-ray diffraction technology with the sin2φ method and MATLAB 2010a software. Microstructural evolution in the top surface subjected to multiple LSP impacts was presented by means of cross-sectional optical microscopy (OM) and transmission electron microscopy (TEM) observations. Experimental results and analysis indicated that residual stress distribution and microstructure at a laser spot depended strongly on the number of multiple LSP impacts, and refined grain and ultra-high strain rate play an important role in the improvement of compressive residual stress of AISI 304 stainless steel. The analysis of treatment of the extended surface was presented to obtain uniform surface properties on the top surface of AISI 304 stainless steel.
Highlights
Laser shock peening (LSP) is a kind of advanced surface enhancing method which employs the mechanical effect of laser shock wave induced by a laser beam to improve the fatigue resistance, damage tolerance, corrosion resistance of metallic materials and alloys
We reported that the improvement of the stress corrosion cracking (SCC) resistance of AISI 304 stainless steel was caused by compressive residual stress and grain refinement after massive LSP impacts [8]
This paper aimed to investigate the effects of different LSP impacts on surface and in-depth residual stress distributions of AISI 304 stainless steel at a laser spot
Summary
Laser shock peening (LSP) is a kind of advanced surface enhancing method which employs the mechanical effect of laser shock wave induced by a laser beam to improve the fatigue resistance, damage tolerance, corrosion resistance of metallic materials and alloys. Over the years, only few researchers have investigated how the influence mechanism of a single LSP impact and the number of multiple LSP impacts on residual stress distribution at a laser spot affect the uniformity of surface properties on the extended surface. The underlying influence mechanism of typical substructure induced by laser shock wave on residual stress distribution at a laser spot was determined and we analyzed how the underlying influence mechanism affects the surface properties’ uniformity on the extended surface These topics can provide some insight into the uniformity of compressive residual stress generated by massive overlapping LSP impacts, which has a lot of practical use in engineering application
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